2. Consider the reaction S2Cl2(l)+CCl4(l) ⇌CS2(g)+3Cl2(g); ΔH°=84.3kJ

 

Which action will maximize the yield of carbon disulfide?

 

Select one:

 a. Decreasing the pressure and decreasing the temperature

 b. Decreasing the pressure and increasing the temperature

 c. Decreasing the volume of the reaction vessel

 d. Increasing the pressure and decreasing the temperature

 e. Increasing the pressure and increasing temperature

 

 

 

4. For the reaction Br2(g)+Cl2(g) 2BrCl(g) at equilibrium, it is found that the concentrations of Br2, Cl2, and BrCl are 0.398 M, 0.351 M, and 2.05×10–2M, respectively. What is the value of Kc?

 

Select one:

 a. 

3.01×10–3

 

 b. 

1.20×10–4

 

 c. 

1.47×10–2

 

 d. 

6.81×101

 

 e. 

3.32×104

 

 

5. For which of the following systems at equilibrium and at constant temperature will decreasing the volume cause no shift in equilibrium?

Select one:

 a. 

NH4Cl(s) ⇌NH3(g)+HCl(g)

 

 b. 

2NO2(g) ⇌2NO(g)+O2(g)

 

 c. 

H2(g)+Cl2(g) ⇌2HCl(g)

 

 d. 

N2(g)+3H2(g) ⇌2NH3(g)

 

 e. 

2H2O (g) ⇌2H2(g)+O2(g)

 

 

6. The equilibrium constant for the reaction H2 (g) +I2 (g) ⇌2HI (g) is 62.5 at 800K. What is the equilibrium concentration of I2 if at equilibrium [HI]=0.6 M and [H2]=0.9 M?

Select one:

 a. 

4.7×10–3M

 

 b. 

6.4×10–3 M

 

 c. 

5.2×10–3M

 

 d. 

0.18M

 

 e. 

2.6×10–2M

 

 

7. The Ostwald process converts ammonia (NH3) to nitric oxide (NO) by reaction with oxygen in the presence of a catalyst at high temperatures. In a test of the process a 1 L reaction vessel is initially charged with 3.90 mol NH3 (g) and 4.90 mol O2 (g), sealed, and heated at a fixed high temperature When equilibrium is established the reaction mixture is analyzed and found to contain 2.90 mol NO (g). What is the value of Kc at this temperature? You will need to use stoichiometry and the equilibrium expression for this reaction.

 a. 

1.42×105

 

 b. 

2.4 ×104

 

 c. 

4.2 ×106

 

 d. 

3.7×103

 

 e. 

None of the above

 

 

8. Which of the following is/are true concerning a chemical reaction at equilibrium?

  1. The system will be a mixture of reactant and products.

  2. The rate of the forward and reverse reactions are equal.

  3. The amounts of each reactant and product are equal.

Select one:

 a. 1 only

 b. 2 only

 c. 3 only

 d. 1 and 2

 e. 1, 2, and 3

 

 

9. Which of the following is/are true concerning equilibrium constants?

  1. When an equilibrium constant is very small, the equilibrium mixture contains more reactants than products.

  2. When an equilibrium constant is very large, the equilibrium mixture contains more products than reactants.

  3. When an equilibrium constant is neither large nor small, the equilibrium mixture contains approximately equal amounts of reactants and products.

Select one:

 a. 1 only

 b. 2 only

 c. 3 only

 d. 1 and 3

 e. 1, 2, and 3

 

 

10. Which of the following would an increase in pressure cause a shift in equilibrium that favors reactants? 

Select one:

 a. CO2(g)+H2(g) ⇌CO(g)+H2O(g)

 

 b. CO(g) +12O2(g) ⇌CO2(g)

 

 c. 2Hg(l)+O2(g) ⇌2HgO(s)

 

 d. 2H2(g)+O2(g) 2H2O(l)

 

 e. CaCO3(s) ⇌CaO(s) +CO2 (g)

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